Open AccessHybrid time-frequency domain equalization for LED nonlinearity mitigation in OFDM-based VLC systems
Author(s) -
Jianfeng Li,
Zhitong Huang,
Xiaoshuang Liu,
Yuefeng Ji
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.000611
Subject(s) - visible light communication , orthogonal frequency division multiplexing , nonlinear distortion , nonlinear system , frequency domain , equalization (audio) , adaptive equalizer , modulation (music) , time domain , electronic engineering , computer science , optics , bit error rate , distortion (music) , telecommunications , physics , light emitting diode , bandwidth (computing) , engineering , acoustics , channel (broadcasting) , amplifier , quantum mechanics , computer vision
A novel hybrid time-frequency domain equalization scheme is proposed and experimentally demonstrated to mitigate the white light emitting diode (LED) nonlinearity in visible light communication (VLC) systems based on orthogonal frequency division multiplexing (OFDM). We handle the linear and nonlinear distortion separately in a nonlinear OFDM system. The linear part is equalized in frequency domain and the nonlinear part is compensated by an adaptive nonlinear time domain equalizer (N-TDE). The experimental results show that with only a small number of parameters the nonlinear equalizer can efficiently mitigate the LED nonlinearity. With the N-TDE the modulation index (MI) and BER performance can be significantly enhanced.